Colling-machine.



A. MD. GBAY. COOLING MACHINE.

I APPLICATION FILED MAR. 6.1917- 1,286,880. Patented Dec.3,1918;

3 win-suit 1.

- I I u clvwe'nfo'c $8 694/ 7 $51 hfs attozmmga I mf'l I A. McD. GRAY.

COOLING MACHINE.

APPLICATION men MAR. s. 1911.

1 ,286,880. Patented Dec. 3, 1918.

.3 SHEETS-fSHEET 3- ATEN c.

ALANSON McD. GRAY, 0F ELIZABETH, NEW JERSEY. COOLING-MACHINE.

Specification of Letters Patent.

V Patented Dec. 3, 1918.

Application filed March 6, 1917. Serial No. 152,917.

To all whom it may concern:

Be it known that I, ALANsoN MoD. GRAY, a citizen of the United. States, residing at 22 Hazard Place, Elizabeth, New Jersey, have invented certainnew and useful; Improvements in Cooling-Machines, of-which the following is a clear, full, and exact'description.

My invention relates to improvements in oil cooling machines and is more particularly designed as an improvement of the apparatus for separating wax from parafiin oil, disclosed in Patent No. 660,251 of October 3, 1899, to P. R. Gray.

In the chilling machine therein described, there is provided a series of cooling vessels, the bottom'of each vessel being connected to the top of the next vessel in the series by a suitable pipe. Each vessel is a water or brine jacket, the respective vessels being also connected. Pumping means is provided to deliver oil distillate to the top of-the first vessel and to force it through the series of vessels, from the bottom of the last one of which it is discharged. water, brine. or ammonia gas. is at the same time pumped through the jackets in. the opposite direction. As the distillate is cooled, paraflinwax is deposited on the inner walls of the vessel and to remove this, each vessel is equipped with a rotary frame having small scraper elements so mounted thereon as to be thrown against the inner wall of the vessel by centrifugal force when the frame is rotated.

jackets of the Such an arrangement as shown in the patent above referred to is satisfactoryv when dealing with light distillates. The pur-f pose of my invention is to provide a machine of this type that is better suited for the treatment of heavy distillates.

On account of the greater density of heavy distillates, the rotary scraper frames in the vessels encounter greater resistance and must therefore be run at a lower speed than when the lighter distillates are being treated. It is also often desirable. in order to reduce the floor space occupied. as well as to bring the cooling medium in the jackets closer to the central portion ofthe contents of the vessels and to minimize the danger of col- 1 ackets, to reduce the dia provided with A cooling medium, such as other purposes.

lapse of the walls of the vessels because of the pressure of the cooling medium in the meters of the cool- These factors result in such a reduction of the peripheral speed of the scraper frame that the scraper elements carried thereby are not subjected to sufficient centrifugal force 'to hold them effectively against the inner over. the deposit vessels is much mg vessels.

on the inner walls of the thicker and denser when Wall of the vessel. Morethe heavy distillate is treated, and there is consequently a tendency on the part of the loosely pivoted scraper elements to ride over a. portion of the deposit. It is therefore an object of my invention to provide improved means for holding the scraper elements positively ag inst the inner walls of the vessels.

As it would be impracticable to force a heavy distillate into the first vessel of the series under suiiicient pressure to carry it past the frames in the successive vessels'and tl fi'ough the pipes between them, especially w more restricted passageway,

object of my invention to provide means for assisting the supply pump by acting on the distillate between each pair of vessels, whereby it need not be introduced into any vessel at a higher pressure than that necessary tb carry it through that vessel. It is also an object of my invention to so arrange these means that they may be independently and quickly removed for the purpose of repair. cleaning, or the like.

ile my invention is particularly adapted for use in connection with the chilling ofheavy oil distillates, it is to be understood that its advantages are by no means limited to that field. but that it is also applicable to the cooling of light dis tillate as well as to other substances whose treatment involves their passage through a series of vessels In the drawings,

Figure 1 is a view in elevation of a ser1es of cooling vessels;

Fig. 2 is an end view of the arrangement in Fig. 1-

Figs. 3 and 4 are enlarged detail views whether for cooling or for with parts broken away to more clearly show the screw-conveyer and scrapers;

Fig. 5 shows the arrangement for automatically returning tillate to the cooling vessels;

Fig. .6 shows a detail view of the thermostat in cross-section; and

Figs. 7 and 8' show a modified mounting for the scrapers carried by the rotary shaft.

Each coolin vessel comprises a cylindrical body mem' er 2, having an inner wall 4 and an outer wall 6, the space between the inner and outer walls forming a jacket for the reception of'the cooling medium. The jackets of adjacent vessels are connected by conduits 7, the conduits between succeeding pairs of vessels being arranged at opposite ends of the vessel common to both pairs, so that the cooling fluid is forced topass throughout the length of each jacket. Each cooling'vessel is provided with a lower head 8, having supporting feet 10 thereon,

and is also provided with an upper head 12 on'which are upstanding brackets 14 supporting a frame 16. Alined bearings 18,

' 20 and '22 are provided in frame 16. upper head 12 and lower head 8 respectively (see Figs. 1 and 4). The vertical scraper shaft 24 extends through these hearings, being supported at its lower end on plate 26 carried .bythe lower head. The upper end of the shaft is provided with a beveled gear wheel 28, arranged to mesh with a beveled spur wheel 30 on thehorizontal shaft 32, carried in a bracket 33 supported on the frame 16. This shaft has tight'and loose pulleys land 6 respectively, whereby the shaft may driven by a belt. Although I have shown each'cooling vessel provided with separate shaft and tight and loose pill-- leys, this .is not essential; the use of an individual driving means for each shaft, however, is sometimes advantageous in case it is desired to rotate only a .portion of the scraper shafts on account of injury to the mechanism carried by the remaining scraper shafts. Each-scraper shaft carries a frame 18' secured thereon and provided with a plurality of scrapers/10. These scrapers are of the same general type as those described in the above mentioned patent, and

.are pivotally mounted" on the frame by means of the lugs 42 on the frame and lugs 44 on each scraper, pivotally connected by the rod 46. In the improved arrangement I mount a coil spring 48 around the rod, one end of the spring being attached to a lug 42" on the frame, the opposite end being secured to one of the lugs 44 on the scraper,

the arrangement of parts being such that theto force the scraper against the inner wall spring tends of the cooling vessel. The action of the spring'thus supplements the centrifugal force, due to the rotation of the scraper frame, and insures that the scrapers insuflicient cooled dis-- ered to a filter -veyer 60. The shaft has collars 62 adjacent its opposite ends which bear against the cylinder heads 63 closing the outer ends of the conduit; each conduit head is provided with packing 64 and a gland 66.

' As will be seen from the drawings, the conduits between successive pairs of vessels are at opposite ends of the vessel-common to both pairs, thus providing that distillate shall be passed through the entire length of each cooling vessel. The cylindrical extensions 52 are offset laterally from the axes of the cylindrical body members "2, and in setting up a battery of the cooling vessels the conduits at the upper and lower ends of the vessel respectively are divided into two groups, the conduits of one group having their axes at one side of the vertical axes of the cooling vessels, and the conduits of :the

other group having their axes at the opposite side of the'vertical axes of the cooling vessels. This is clearly shown in Figs. land 2. By this arrangement it is possibleto withdraw any one-of the shafts 58, together with its screw-conveyer, without disturbing any cessive conduits at the upper or lower ends of the vessels will be arranged -on opposite sides of the vertical axes of the vessels, but

as shown in the lower right-hand portion of of the other shafts 58. In. general, suc- Fig. 1 of the drawing, two adjacent conduits may be placed in alinement'on the same side of the vertical axes of their respective ves}, sels, a single shaft being used for both 'con duits and being withdrawn through the end of one' ofthem. with a sprocket 68. i .The sprockets 68 on the shafts in the upper conduits are directly connected by chains 70 to sprockets 72 on the driving shafts 32, and each of the upper shafts 58yis provided with an additional sprocket 74, connected by the chain 76- to a sprocket .7 8; on a counter-shaft 80 mounted in brackets-82 on a suitable support 84, andhaving a sprocket 86 connected by a sprocket: chain 88 to the sprocket wheel 68 on one of the shafts 58 inthe lowerconduit. j

The last cooling ,vefi'el of the series is provided with a dischargepipe 92. From this discharge'pipe leads; a delivery pipe 94;, through which Each shaft 58 is provided.

the cooled distillate is "deliv-v f; tankv or the like. Also leadopening and closing of val ing from the discharge pipe 92 is the return pipe 96 discharging one of the cooling vessels. In the discharge pipe 92 is a thermostat 98, comprising a tube 100 having its lower end extendin into the interior of the discharge pipe and aving at its upper end apair of spaced, insulated contacts 102. i In the tube is a mercury column 104. The contacts 102 are the terminals of the circuit 106 of the solenoid 108, said circuit comprising also the storage battery 110. In the delivery pipe 94 is a valve 112, and in the discharge pipe 96 is a similar valve 114. These valves are connected together and to the core 116 of the solenoid by the links 118, 120. When the temperature of the distillate in the discharge pipe 92 rises above a predetermined point, the mercury 104 will expand and bridge the opening between the contacts 102, thus completing the circuit 106 andenergizing the solenoid 108, causing the core 116 to be drawn inward and thusclosing the valve 112 in the delivery pipe and opening the-valve 114 in the return pipe. When the temperature of the distillate falls below the predetermined point, the circuit 102 will be broken by the withdrawal of the mercury column 104 between the contacts 102. and the solenoid will be deenergized The spring 122 will then act to move the core 116 of valve 112, at the same 'time closing the valve 114.

By this arrangement it will be seen, that,

ling vessels fail to cool the in case the 000 this distillate will be distillate sufiiciently,

automaticallyreturned to the cooling vessels 7 18 for further treatment, and the danger of supplying the filter tank. or the like, withsufiiclently cooled material is eliminated.

e above disclosure of a thermostatic control is illustrative and diagrammatic imerely, and is not intended to represent an actual commercial installation. cient, however, to enable any one skilled-in the art to reduce my invention to commercial form, as automatic control of the ves by means of thermostats is well known. tice it is my intention generally to use one .of the types of temperature responsive mechanisms manufactured by the Geissinger Regulator Company of New York and illustrated in their catalogues.

I have shown the return pipe as emptying into the last vessel of the series, as repassage through this vessel, in which the cooling medium is at its lowest temperature will usually be sulficient to cool the oil to the desired point. The return pipe may, however, be connected to deliver the insufficiently cooled oil at any other desired point in the system. By placing between each two cooling vessels means for positively forcing the distillate from one vessel into the other, I

into the upper end of,

the solenoid and open. the

It is sulfi In actual pracam able to successfully treat comparatively heavy distillates. In fact, the machine is capable of handling parafiin in a semi-solid or mushy state.

From the above it will be seen that in my invention the described elements cooperate to maintain a constant flow of the distillate and the wax precipitated therefrom through the series of vessels, delivering the mixture at the desired temperature to a filter tank or the like; clogging of the system by the accumulation of wax on the walls of the vessels or by the densifying ofthe mass of distillate in the vessels, or in the conduits connecting them, is positively prevented. The spring pressed scrapers and the screw conveyers act on the distillate at practically every point of its path of flow to prevent the my invention, it is to be understood that modifications may be introduced within the scope of the appended claims. It is not essential that the cooling vessels be arranged vertically: they may, if desired, be arranged horizontally. The cooling vessels may, moreover, be arranged in compact groups. rather, than in a linear series. The conduits between the vessels may forcing means than screw conveyers. Any suitable type of thermostatically controlled mechanism for operating valves in the delivery and return pipes may be substituted for that' shown. Instead of securing the scrapers 40 to a more'or less yielding frame I may, as shown inFigs. 7 and '8, mount them on lugs 43 secured directly to the shaft 24. 7

What I claim as new is:

1. In combination, cooling vessels, a rotatablescraper' frame in each vessel forscrapingcongealed substance from the walls of said "vessels,"said scraper ames and vessels-being constructed to mitthe free flow of material lengthwise of said. vessels. a conduit between the vessels of each pair of vessels and smaller in diameter than each vessel, and means in said conduit for forcing the material to be cooled through said vessels.

2. The combination of a series of cooling vessels arranged sideby side, a conduit for each pair of vessels connecting corresponding ends of said paired vessels, at-the respective ends of the vessels being divided into groups located at opposite sides of the axes of said'vessels, and a conveyer in each conduit.

duits being out of axial alinement with one conduit, eachof said con-.

befitted with other a series bf upright perthe conduits 1 of the adjacent conduits, to permit the withdrawal of each screw conveyer through the end of its conduit.

'tion in said vessel,

4. The combination with a cylindrical vessel, having a wall, the inner Surface of which is adapted to receive a film of adhering material, of a scraper frame mounted for rotaa scraper pivotally mounted on said frame, its pivot extending substantially parallel with the axis of said :vessel so that there is a tendency for said scraper to swing outwardly on its said pivot frame and said scraper,

- portion and extending laterally as .the axis of said vessel",

-.the .material adhering thereof, each head 'wardly concave portion and a cylindrlcal due to centrifugal force, a helical spring coiled about said pivot and the ends of which are engaged respectively with said whereby said outwardly about scraper is positively forced its said pivot to supplement the action of the 5.. In an oil distillate chilling machine,

in combination, a plurality f cooling ves-."

sels, each vessel comprising a body portion a head -.detac'hably mounted at each end having an 'eccentrlc, 1n-

portion communicating with said concave therefrom, with its axis crossing said head laterally of means for securing each of said cylindrical portions to a corresponding portion on the head of an adjacent vessel-to form a cylindrical conduit between said vessels,

a screw conveyer for rotation in said conduit to force the contents of one vessel into the adjacent vessel.

ally members,

6. In combination, a series of cooling vessels, each of member, a head for each end thereof, the head's at one end of each pair of vessels being joined by a cylindrical conduit member extending laterally. from each head, and with its axis crossing said heads laterof the axes of said cylindrical body each head being eccentrically recessed to provide a passage between said body and said head, a conveyer mounted in each "conduit, a rotatable shaft extending axially of each vessel and having a central bearing in each head thereof, scrapers carried by said shaft for operating on the inher wall of said vessel, driving means sels, means for at one end said bearing,

said vessels comprising a cy-' lindric'al body side of mounted; on certain of said heads, and connections from said driving means to said shafts and conveyors.

7.'In combination, a pair of cooling vesforcing, the liquid being cooled from one vessel to the other, comprising a cylindrical conduit connecting the vessels at one end, said conduit connected to each vessel laterally of the axis thereof, a

rotatable shaft extending through said con-- duit and removably mounted therein, a on said shaft and closures for the ends of. said conduit removab mounted thereon to permit the removal of said conveyer and shaft.

8. In combination, a cooling vessel, a cylindrical bodymember, a head therefor, said head having an eccentric recess therein, a rotary scraper frame in said body member, a shaft on which said frame is mounted, a bearing forsaid shaft central of said head, and a conveyer mounted in said head laterally of said bearing.-

9. A cooling vessel comprising, in cominwardly opening" bination, a vessel proper, a hollow head fixed ofsaid vessel, said head having a centrally located bearing and a cylindrical portion extending laterally at substantially a right angle to said vessel but located to one side of the longitudinal axis ofs'aid vessel, a rotary shaft with a scraper to scrape ofi the congealed material on the inner surface of said vessel, one end of said shaft being journaled in and a screw-conveyer rotatable in said cylindrical portion.

10. The combination of two cooling vessels, hollow heads fixed at corresponding ends of said vessels, said heads having centrally located bearings, and two abutting and connected cylindrical portions, each extending laterally from said 'head at substantially a right angle to its corresponding vessel but located to one side of the longitudinal axis of said vessel, a rotary shaft for each vessel coincident with said axis. and provided within said vessel with a scraper to scrape off the congealed material on the inner surface of said vessel, one end of said coincident with. said axis and provided within said vessel shaft being journaled in its corresponding 1 and a screw-conveyer located to one the said bearings and rotatable in said connected cylindrical portions.

Signed at New York, N. Y., this 21st day of February, 1917.

ALAN S ON MoD. GRAY.

bearing 

